MEMS Single-Axis Mirror for Zigzag Correction
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Solution Overview
Problem
Existing laser printing technologies face challenges in maintaining precise alignment and quality due to the limitations of rotating polygon mirrors and single-axis flat mirrors, which result in zigzag effects and inefficiencies, particularly in producing parallel lines on a moving photosensitive medium.
Innovation Solution
A micro-electromechanical systems (MEMS) single-axis mirror is used to provide oscillating tilt and raster scanning, creating a lemniscate pattern that synchronizes with the motion of a photosensitive medium to produce parallel lines orthogonal to its movement, thereby correcting the zigzag effect and improving print quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flat mirror is used for one-direction printing, then device complexity is reduced, but productivity decreases due to low duty cycle requiring two times the on/off switching speed
Solution Approach 1:
The patent applies dynamics by transitioning from a static single-direction mirror to a dynamic resonant scanning mirror that oscillates continuously in both directions. The mirror operates at its resonant frequency, enabling continuous printing during both forward and return scans, thereby doubling productivity while maintaining simple single-mirror configuration.
Solution Approach 2:
The patent implements periodic action by utilizing the mirror's natural resonant oscillation frequency. The laser beam is modulated in sync with the mirror's periodic scanning motion, turning the mirror on during both forward and return scans. This synchronized periodic operation eliminates idle time and maximizes printing productivity.
2Productivity
If a single flat mirror scans in both directions, then productivity improves, but manufacturing precision deteriorates due to zigzag effect
Solution Approach 1:
The patent applies feedback by using a feedback coil that detects the mirror's position and adjusts the scanning angle in real-time. This feedback mechanism compensates for the zigzag effect by dynamically correcting the mirror's angular position, ensuring that lines remain parallel and orthogonal to the page despite bidirectional scanning.
Solution Approach 2:
The patent changes the scanning parameter by introducing a variable scanning angle controlled by the feedback coil. Instead of maintaining a fixed scan angle, the system dynamically adjusts the angle to compensate for positional deviations, thereby eliminating the zigzag effect and maintaining manufacturing precision.
3Manufacturing precision
If rotating polygon mirror is used, then manufacturing precision is maintained, but device complexity increases and cost increases
Solution Approach 1:
The patent extracts the essential scanning function from the complex rotating polygon mirror mechanism and implements it using a simple resonant oscillating mirror. By removing the polygon structure and multi-facet rotation mechanism, the system achieves the same line alignment precision with dramatically reduced device complexity and lower cost.
Solution Approach 2:
The patent creates a simplified copy of the polygon mirror's scanning function using a single resonant mirror. Instead of replicating the complex multi-facet rotation, the system uses a single mirror that oscillates back and forth, copying the essential raster scanning behavior while eliminating mechanical complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MEMS single-axis mirror solution offers a cost-effective and efficient method for printing parallel lines, eliminating the zigzag effect and maintaining high print quality by precisely controlling the oscillating tilt of the mirror, resulting in improved alignment and reduced operational costs compared to traditional systems.
Implementation Method 1
A micro-electromechanical systems (MEMS) single-axis mirror is used to provide oscillating tilt and raster scanning
Implementation Method 2
a light source providing a modulated beam of light
Data Source
AI summary
A MEMS device, a printer and a method of printing is presented including providing a light source producing a modulated beam of light, positioning a mirror with a reflective surface to intercept the modulated beam of light. Allowing the mirror to rotate on a single-axis hinge structure such that the resultant reflected beam is swept in a scan plane and creating an image at an intersection of the scan plane and an image plane. Causing the mirror to rotate about the single-axis hinge structure and to oscillate at a tilt about the single-axis hinge structure, wherein the resultant reflected beam of light forms a lemniscate pattern along the image plane, and wherein the lemniscate pattern has an inner angle between a left sweep segment and a right sweep segment of the image. Synchronizing the inner angle of the lemniscate pattern formed on the image plane to a motion of a photosensitive medium such that an image is formed on the photosensitive medium along lines substantially parallel to each other and orthogonal to the movement of the photosensitive medium.